tests: enable tcti-pcap tests on big endian platforms #2125
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Fixes the tcti-pcap tests for big endian platforms. Fixes #2113.
There are two layers here: the pcap blocks are always dumped in host endianness. Everything else (IPv4, TCP, etc.), however, is dumped in network endianness aka big endian.
Therefore, on test layer, only the pcap-layer byte streams are affected by host endianness and need to be swapped.
This fixes the test on an s390x qemu machine with alpine.